i'm still trying to figure out how Control Theory links to neuroscience and computer science, but no probability, mathematics, or engineering. maybe the field is just so old that there are no new contributions from those areas? economics could probably benefit from a little control theory, too.

Electrical engineering is spread around in multiple tiny disciplines, and mechanical engineering is non-existent.

The latter omission points out one huge bias: Journal selection. They didn't use any ASME journals! "Death studies" is a scientific pursuit, but mechanical engineering isn't?

Another bias is in the way people in different disciplines write papers. The list of references can be rather short in a mathematics, the hard sciences, or engineering journal paper. In the social sciences, papers in which the list of references is longer than the body of the paper is the norm. A math paper with 20 references might well come back with reviewer comments, "why so many references?" A linguistics paper with 50 references might well come back with reviewer comments, "why so few references?"

A field where papers typically stand on their own merits will artificially suffer by the methodology apparently used by the developers of this map.